Help me.......What is the 6SN7 ??????? - diyAudio
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Old 16th June 2007, 08:24 AM   #1
cd149dc is offline cd149dc  Viet Nam
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Default Help me.......What is the 6SN7 ???????

Hello,

Anyone could tell me what version of 6SN7 tube.

Thank you so much,

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Old 16th June 2007, 08:17 PM   #2
gianis is offline gianis  Greece
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Default 6SN7

6sn7 with ceramic elements???? Strange to me.....
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Old 16th June 2007, 08:20 PM   #3
anatech is offline anatech  Canada
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Hi cd149dc,
I've never seen one like that either. It may be industrial, military or remarked Russian for all I know. If it is really a 6SN7, I'll bet it is not microphonic. Have you tried it in anything?

-Chris
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Old 16th June 2007, 09:02 PM   #4
Colt45 is offline Colt45  Serbia
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Never seen it before. what does the stamp on the side say.. i cant see from the pictures.

anything on the bottom of the base?
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Old 16th June 2007, 10:32 PM   #5
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Ditto here.

Geometry looks like classic 6SN7 (have a normal one here), with anode surface somewhat larger. I guess that it is somehow a higher anode dissipation type, or designed to work in very hot areas plus perhaps conditions of vibration/shock.

Cd149dc, can you tell us where you found it or any more information? Most interested.
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Old 17th June 2007, 10:25 AM   #6
ilimzn is online now ilimzn  Croatia
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East German military 6SN7 (often has both US and russian markings) made by WF. I have a couple of those with the original labeling intact, it comes above the 6SN7 mark on yours. I'm not sure the elements are ceramic, but rather something like compressed mica. Still, they work very well...
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Old 17th June 2007, 01:11 PM   #7
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Very interesting tube. I've collected a lot of different 6SN7s, but I've never seen one like that. The ceramic support wafers have that "Red Bank" appeal.

As Johan suggests, the larger radiator fins coming off both sides of the plates ought to give a larger plate dissipation rating, all else being equal.

Ilimzn or cd149dc, do either of you have the East German part number, and the data sheet associated with it? I'm curious about how similar this tube is to a regular 6SN7.
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Old 17th June 2007, 01:27 PM   #8
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A picture of the Werk Fernmeldewesen type is
here

Maybe the previous owner no longer appreciated the Russian type marking.
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Old 17th June 2007, 02:49 PM   #9
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Jacco's linked photo shows dual markings: 6H8C and 6SN7. The data sheet for the 6H8C suggests a near equivalent to the 6SN7. Max plate voltage and dissipation ratings are lower, surprisingly. Whether the 6H8C shares the fabled linearity of the 6SN7, I can't say.

6H8C data sheet
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Old 17th June 2007, 03:42 PM   #10
anatech is offline anatech  Canada
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Hi Brian, Jacco,
That make sense.

Thank you for pointing out the datasheets.

-Chris
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